For A = {1, 2, 3}, identify which is a PROPER subset of A.

AA itself

Bℕ

C{1, 2, 3, 4}

D{1, 2}

Answer & Solution

Correct answer: D. {1, 2}

A proper subset of A is a set B with B ⊂ A and B ≠ A. {1, 2} ⊂ A and {1, 2} ≠ A → proper subset. A itself is a subset but not proper. {1, 2, 3, 4} is a SUPERSET, not subset. ℕ ⊅ A's complement.

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